1958 BMW Isetta also known as the "bubble car" is an Italian designed microcar. It was the world's first mass-production km car and was the top-selling single-cylinder car in the world, with units sold.
This one would be perfect for G-ma to get to work. Little green pea car! Yes, can't you just see smooshed green pea car when some uncoordinated SUV driver "bumps" into it? Not good- cute and efficient but that is a bit of problem.